Novel ultra-high-strength (ferrite + austenite) duplex lightweight steels achieved by fine dislocation substructures (Taylor lattices), grain refinement, and partial recrystallization

Sohn, Seok Su; Song, Hyejin; Suh, Byeong-Chan; Kwak, Jai Hyun; Lee, Byeong-Joo; Kim, Nack J.; Lee, Sunghak

doi:10.1016/j.actamat.2015.06.024

Cited by 149 publications

(38 citation statements)

References 47 publications

(101 reference statements)

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“…As a summary of the mechanical properties measured so far for high specific strength steels, Fig. 4c and d compare the tensile properties of our HSSS with that of Kim et al [27], as well as with the conventional FeeMneAleC based austenitic [5,11,24], duplex [20,25] and triplex [17,23,26] steels. As can be seen, the HSSS in the present study shows an outstanding combination of the specific yield strength (SYS) and uniform elongation, while exhibiting an acceptable combination of the yield strength-to-ultimate tensile strength (YS-to-UTS) ratio and the uniform elongation.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

“…However, the mechanism of strain hardening remains an open issue for most high strength steels [5,22,27], because they deform very heterogeneously due to their inhomogeneous microstructures. Even for an initial single-phase alloy, for instance TWIP and TRIP steels, deformation twins and martensite formation make the strain hardening behavior complex [20,22]. Bhadeshia [28] pointed out that in TRIP steels it is unlikely that the large tensile elongation is predominantly caused by the transformation from austenite into martensite alone.…”

Section: Introductionmentioning

confidence: 99%

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Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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Keywords:High specific strength steel Dual-phase nanostructure Strain hardening Ductility In situ high-energy X-ray diffraction a b s t r a c tWe report a detailed study of the strain hardening behavior of a Fee16Mne10Ale0.86Ce5Ni (weight percent) high specific strength (i.e. yield strength-to-mass density ratio) steel (HSSS) during uniaxial tensile deformation. The dual-phase (g-austenite and B2 intermetallic compound) HSSS possesses high yield strength of 1.2e1.4 GPa and uniform elongation of 18e34%. The tensile deformation of the HSSS exhibits an initial yield-peak, followed by a transient characterized by an up-turn of the strain hardening rate. Using synchrotron based high-energy in situ X-ray diffraction, the evolution of lattice strains in both the g and B2 phases was monitored, which has disclosed an explicit elasto-plastic transition through load transfer and strain partitioning between the two phases followed by co-deformation. The unloadingreloading tests revealed the Bauschinger effect: during unloading yield in g occurs even when the applied load is still in tension. The extraordinary strain hardening rate can be attributed to the high back stresses that arise from the strain incompatibility caused by the microstructural heterogeneity in the HSSS.

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Section: Microstructural Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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“…Such expectations have been realized in recent decades by low-density steels, which are mainly based on FeAl-Mn-C alloy system and are so called TRIPLEX steels. These TRIPLEX steels generally consist of fcc austenite, bcc ferrite and finely dispersed nanometer-sized κ-carbides with (Fe, Mn) AlC 3 type [17][18][19][20][21][22][23]. More recently, Kim et al [24] has developed a high specific strength steel (HSSS) with composition of Fe-16Mn-10Al-0.86C-5Ni (weight %), which consists of both fcc austenite phase and intermetallic compound B2 phase.…”

Section: Introductionmentioning

confidence: 99%

Deformation mechanisms for superplastic behaviors in a dual-phase high specific strength steel with ultrafine grains

Wang

Yang

Yan

et al. 2017

Materials Science and Engineering: A

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“…The volume fractions of retained austenite (RA) were calculated from the XRD measurements using Cu-Kα radiation on the basis of integrated intensities of the (200)α, (211)α, (200)γ, (220)γ and (311)γ diffraction peaks. The average C content of RA grains can be estimated by the measured lattice parameters and the compositions of austenite grains using the following equation [16,17]:…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes

Luo

2017

Metals

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Abstract:We investigated both the microstructures and tensile properties of 7Mn steel, which was either hot-rolled, warm-rolled or cold-rolled before intercritical annealing at 700 • C for 5 h. It can be concluded that the warm-rolled and annealed microstructures are a kind of mixture of hot rolled and cold rolled ones. They are composed of ferrite and retained austenite, the latter having a wide size distribution and two types of morphologies: equiaxed and lamellar. These retained austenite grains are expected to transform to martensite in a more sustainable way-the warm-rolled and annealed steel exhibits the best combination of ultimate tensile strength and total elongation among the three studied steels and a shorter yield point elongation than the cold-rolled one.

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Novel ultra-high-strength (ferrite + austenite) duplex lightweight steels achieved by fine dislocation substructures (Taylor lattices), grain refinement, and partial recrystallization

Cited by 149 publications

References 47 publications

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Deformation mechanisms for superplastic behaviors in a dual-phase high specific strength steel with ultrafine grains

Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes

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